I have an adult site. When I attempt to add search terms only some of them appear. Why is that?

7Search.com's advertiser keyword management system is reflective of how a URL is set up. Since the URL is an adult URL, the search terms must be adult search terms. Search terms that contain non-adult words cannot be added to an adult URL via the account holder. Please send any rejected search terms you are attempting to add to Customer Support and we will upload the search terms to the account.